an ISO 9001:2008 Registered Company

1967-68 Ford MustangMercury Cougar

without Factory AirEvaporator Kit

(551168)

18865 Goll St. San Antonio, TX 78266 Phone: 210-654-7171

Fax: 210-654-3113www.vintageair.com

901277 REV G 02/02/21, PG 1 OF 24

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901277 REV G 02/02/21, PG 2 OF 24

Thank you for purchasing this evaporator kit from Vintage Air. When installing these components as part of a complete SureFit™ system, Vintage Air recommends working from front to back on the vehicle, installing the condenser kit, hose kit, and compressor first, followed by the wiring, evaporator, and finally the control panel.

Cover..................................................................................................................................Table of Contents.................................................................................................................Packing List/Parts Disclaimer..................................................................................................Information Page..................................................................................................................Wiring Notice.......................................................................................................................Engine Compartment Disassembly, Condenser Assembly and Installation, Compressor and Brackets, Passenger Compartment Disassembly........................................................................Defrost Duct and Fresh Air Cap Installation..............................................................................Firewall Cover Installation.....................................................................................................Evaporator Installation.......................................................................................................... Vintage Air Center Louver Installation, (Optional) Center Louver Installation Using OEM Center Vent Trim................................................................................................Drain Hose Installation, Lubricating O-rings, A/C Hose Installation............................................ Heater Hose & Heater Control Valve Installation.....................................................................A/C and Heater Hose Routing............................................................................................... Under Dash Louver Installation............................................................................................ Final Steps........................................................................................................................ Control Panel & Duct Hose Routing....................................................................................... Evaporator Hardline Installation...........................................................................................Wiring Diagram..................................................................................................................Gen IV Wiring Connection Instruction....................................................................................Operation of Controls..........................................................................................................Troubleshooting Guide.........................................................................................................Troubleshooting Guide (Cont.).............................................................................................OEM Center Vent Trim Louver Template.................................................................................Packing List.......................................................................................................................

1 2 3 4 5

6 7 8 9

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901277 REV G 02/02/21, PG 3 OF 24

Packing List: Evaporator Kit (551168)

No. 1.2.

Qty.11

Part No.744004-VUE781067

DescriptionGen IV 4-Vent Evaporator Sub CaseAccessory Kit

** Before beginning installation, open all packages and check contents of shipment. Please report any shortages directly to Vintage Air within 15 days. After 15 days, Vintage Air will not be responsible for missing or damaged items.

NOTE: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

1

2

Gen IV 4-VentEvaporator Sub Case

744004-VUE

Accessory Kit781067

4

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901277 REV G 02/02/21, PG 4 OF 24

Important Notice—Please ReadFor Maximum System Performance, Vintage Air Recommends the Following:

New Vintage Air-Supplied Sanden Compressor: No additional oil needed (Compressor is shipped with proper oil charge).All Other Compressors: Consult manufacturer (Some compressors are shipped dry and will need oil added).

NOTE: Vintage Air systems are designed to operate with R134a refrigerant only. Use of any other refrigerant could damage your A/C system and/or vehicle, and possibly cause a fire, in addition to potentially voiding the warranties of the A/C system and its components.

Refrigerant Capacities:Vintage Air System: 1.8 lbs. (28.8 oz.) or 816 grams of R134a, charged by weight with a quality charging station or scale. NOTE: Use of the proper type and amount of refrigerant is critical to system operation and performance.Other Systems: Consult manufacturer’s guidelines.

Lubricant Capacities:

Safety Switches

Service Info:Protect Your Investment: Prior to assembly, it is critical that the compressor, evaporator, A/C hoses and fittings, hardlines, condenser and receiver/drier remain capped. Removing caps prior to assembly will allow moisture, insects and debris into the components, possibly leading to reduced performance and/or premature failure of your A/C system. This is especially important with the receiver/drier. Additionally, when caps are removed for assembly, BE CAREFUL! Some components are shipped under pressure with dry nitrogen.Evacuate the System for 35-45 Minutes: Ensure that system components (Drier, compressor, evaporator and condenser) are at a temperature of at least 85°F. On a cool day, the components can be heated with a heat gun or by running the engine with the heater on before evacuating. Leak check and charge to specifications.

Your Vintage Air system is equipped with a binary pressure safety switch. A binary switch disengages the compressor clutch in cases of extreme low pressure conditions (refrigerant loss) or excessively high head pressure (406 PSI) to prevent compressor damage or hose rupture. A trinary switch combines Hi/Lo pressure protection with an electric fan operation signal at 254 PSI, and should be substituted for use with electric fans. Compressor safety switches are extremely important since an A/C system relies on refrigerant to circulate lubricant.

Bolts Passing Through Cowl and/or Firewall:To ensure a watertight seal between the passenger compartment and the vehicle exterior, for all bolts passing through the cowl and/or firewall, Vintage Air recommends coating the threads with silicone prior to installation.

Heater Hose (not included with this kit):Heater hose may be purchased from Vintage Air (Part#31800-VUD) or your local parts retailer. Routing and required length will vary based on installer preference.

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901277 REV G 02/02/21, PG 5 OF 24

Important Wiring Notice—Please Read

Some vehicles may have had some or all of their radio interference capacitors removed. There should be a capacitor found at each of the following locations:

1. On the positive terminal of the ignition coil.2. If there is a generator, on the armature terminal of the generator.3. If there is a generator, on the battery terminal of the voltage regulator.

Most alternators have a capacitor installed internally to eliminate what is called “whining” as the engine is revved. If whining is heard in the radio, or just to be extra cautious, a radio interference capacitor can be added to the battery terminal of the alternator.

It is also important that the battery lead is in good shape and that the ground leads are not compromised. There should be a heavy ground from the battery to the engine block, and additional grounds to the body and chassis.

If these precautions are not observed, it is possible for voltage spikes to be present on the battery leads. These spikes come from ignition systems and charging systems, and from switching some of the vehicle’s other systems on and off. Modern computer-operated equipment can be sensitive to voltage spikes on the power leads, which can cause unexpected resets, strange behavior and/or permanent damage.

Vintage Air strives to harden our products against these types of electrical noise, but there is a point where a vehicle’s electrical system can be degraded so much that nothing can help.

Radio interference capacitors should be available at most auto and truck parts suppliers. They typically are cylindrical in shape, a little over an inch long and a little over a half-inch in diameter, and they have a single lead coming from one end of the cylinder with a terminal on the end of the wire, as well as a mounting clip which is screwed into a good ground on the vehicle. The specific value of the capacitance is not too significant in comparison to ignition capacitors that are matched with the coil to reduce pitting of the points.

Care must be taken, when installing the compressor lead, not to short it to ground. The compressor lead must not be connected to a condenser fan or to any other auxiliary device. Shorting to ground or connecting to a condenser fan or any other auxiliary device may damage wiring or the compressor relay, and/or cause a malfunction.

When installing ground leads on Gen IV systems, the blower control ground and ECU ground must be connected directly to the negative battery post.

For proper system operation, the heater control valve must be connected to the ECU.

•

•

•

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901277 REV G 02/02/21, PG 6 OF 24

Engine Compartment Disassembly

1.2.3.4.5.

Disconnect battery.Remove battery (retain).Drain radiator.Remove radiator (retain).Remove the OEM heater hoses (discard).

NOTE: Before starting the installation, check the function of the vehicle (horn, lights, etc.) for proper operation, and study the instructions, illustrations, & diagrams.Perform the Following:

Figure 2

Figure 1

Condenser Assembly and Installation1.2.

Refer to separate instructions included with the condenser kit to install the condenser.Binary switch installation (Refer to condenser instructions).

Compressor and Brackets1. Refer to separate instructions included with the bracket kit to install the compressor bracket.

Passenger Compartment Disassembly

1.2.3.4.

5.6.7.

Remove the glove box (retain) (See Figure 1, below).Remove the center console (if equipped).Remove the heater assembly and all related ducting (discard, but retain screws) (See Figure 2, below).Remove OEM control panel assembly (retain) (See Figure 1, below). NOTE: Refer to control panel conversion kit instructions for installation of controls.Remove the radio (retain) (See Figure 1, below).Remove the OEM defrost ducts (discard) (See Figure 2, below).Remove the dash brace (discard) (See Figure 2, below).

Perform the Following:

MUSTANG

Radio

GloveBox

DashBrace OEM Heater

Assembly

DefrostDucts

7

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901277 REV G 02/02/21, PG 7 OF 24

Defrost Duct and Fresh Air Cap Installation

1.2.3.4.5.

Install the defrost ducts under the dash, and secure using (4) OEM nuts as shown in Figure 3, below.Hold the fresh air cap under the dash and mark the (3) mounting holes.Drill (3) 1/8” mounting holes under the dash (See Figure 3, below).Apply a 1/4” bead of silicone around the mating surface of the fresh air cap as shown in Figure 3, below.Secure the fresh air cap to the fresh air hole using (3) #10 x 1/2” sheet metal screws as shown in Figure 3, below.

Figure 3

Driver SideDefrost Duct

626676

Passenger SideDefrost Duct

626680

(4) OEMNuts

(3) #10 x 1/2”Sheet Metal

Screws

Fresh AirCap

62354-VFE

Silicone

Drill (3) 1/8” Holes

8

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901277 REV G 02/02/21, PG 8 OF 24

Firewall Cover Installation1.2.3.

Install (3) grommets onto the firewall cover as shown in Figure 4, below.Apply a 1/4” bead of silicone around the mating surface of the firewall cover as shown in Figure 4a, below.Secure the firewall cover to the firewall using (4) 1/4-20 x 1” hex bolts, flat washers and nuts, and (1) #10 x 1/2” sheet metal screw (See Figure 4, below). NOTE: The firewall cover installs on the engine compartment side of the firewall.

Figure 4a

Figure 4#10 x 1/2”Sheet Metal

Screw

Silicone

EngineCompartment

Side of Firewall

FirewallCover

642068

Grommet33137-VUI

Grommet33134-VUI

Grommet33135-VUI

(4) 1/4-20 x 1”Hex Bolts

and Washers

OEM DimpleDrill 1/8” Hole

(4) 1/4” Nutswith Star Washers

(4) 1/4” Flat Washers

OEM HeaterCore Holes

(4) OEMBlower Motor

Mounting Holes

OEM Blower MotorHole in Firewall

9

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901277 REV G 02/02/21, PG 9 OF 24

Evaporator Installation

1.

2.

3.4.

5.

6.

7.

On a workbench, install the evaporator rear brackets and hardlines with properly lubricated O-rings (See Figure 9, Page 11, and Figure 16, Page 17).Install the front mounting bracket onto the evaporator using (2) 1/4-20 x 1/2” hex bolts, and tighten as shown in Figure 5, below.Drill (2) 9/32” holes in firewall using OEM dimples (See Figure 5a, below).Lift the evaporator unit up under the dashboard. Secure loosely to the firewall from the engine compartment side using (2) 1/4-20 nuts and washers (See Figure 5a, below). NOTE: To ensure proper drainage, it is very important that the evaporator is level, both left-right and fore-aft. Check for level on the flat portions of the case around the drain.Using the front evaporator bracket as a guide, mark and drill (2) 3/16” holes in the cowl (See Figure 5b, below).Using (2) #14 x 3/4” sheet metal screws, secure the front evaporator mounting bracket to the inner cowl (See Figure 5b, below).Verify that the evaporator unit is level and square to the dash; then tighten all mounting bolts. NOTE: Tighten the bolt on the firewall first. Then tighten the front mounting bracket sheet metal screws.

NOTE: To ensure a watertight seal between the passenger compartment and the vehicle exterior, for all bolts passing through the firewall, Vintage Air recommends coating the threads with silicone prior to installation.

Figure 5

Figure 5a Figure 5b

Evaporator Front Bracket643169-FCB

(2) 1/4-20 x 1/2”Hex Bolts

OEM DimpleDrill 9/32”

Hole

OEM DimpleDrill 9/32”

Hole

Passenger SideEvaporator

Mounting Hole

Driver SideEvaporator

Mounting Hole

Approximately 3”

Approximately 3 ½”

OEM HeaterCore Holes

(2) 1/4-20 Nutsand Flat Washers

Passenger Compartment

Side of Firewall

Drill (2) 3/16”

Holes

(2) #14 x 3/4”Sheet Metal

Screws

InnerCowl

10

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901277 REV G 02/02/21, PG 10 OF 24

Vintage Air Center Louver Installation

(Optional) Center Louver Installation,

Using OEM Center Vent Trim

1.2.3.

1.

2.3.

Remove the OEM center vent trim from the dash as shown in Figure 6, below.Modify the center louver opening on the dash as shown in Figure 6a, below.Install the center louver assembly into the dash as shown in Figure 6b, below.

Cut the OEM center vent trim using the template provided on Page 23 (See Figure 7, below). NOTE: Remove the louver from the center louver assembly.Install the louvers into the OEM center vent trim as shown in Figure 7, below.Reinstall the OEM center vent trim into the dash as shown in Figure 7, below.

Figure 6

Figure 7

Figure 6a

Figure 6b

CUT OUTCUT OUT

OEM CenterVent Trim

Cut &Remove5/8” 5/8”

Center LouverAssembly590068

Assembled View

OEM Center Vent Trim (If Using Aftermarket

Trim, Center Template)

OEM CenterVent Trim

(2) Louvers

Center LouverBracket642060

(2) #6 x 3/8”Pan Head Screws

11

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901277 REV G 02/02/21, PG 11 OF 24

Figure ##

O-ring Installs Over Male Insert to Swaged Lip

O-ring#6 O-ring

#8 O-ring #10 O-ring

O-ring

Supplied Oil for O-rings

Male Insert

Female Nut

Hold With This Wrench

Twist With This Wrench

Lubricating O-rings For a proper seal of fittings: Install supplied O-rings as shown and lubricate with supplied oil.

NOTE: Standard torque specifications:#6: 11 to 13 ft-lb.#8: 15 to 20 ft-lb.

#10: 21 to 27 ft-lb.

Figure 9

Drain Hose Installation1.2.

3.4.

Locate the evaporator drain on the bottom of the evaporator case.In line with the drain, lightly make a mark on the firewall. Then, measure 1” down and drill a 5/8” hole through the firewall (See Figure 8, below).Install the drain hose onto the evaporator drain on the bottom of the unit, and route it through the firewall.Install a 1/2” 90° drain elbow onto the drain hose (See Figure 8, below).

Figure 81”

1/2” Drain Elbow

DrainHose

Drain

A/C Hose Installation

1.

2.

3.

4.

Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 9, above) and connect the 45° fitting to the #8 discharge port on the compressor. Then route the straight female fitting with service port to the #8 condenser hardline coming through the radiator core support (See Figure 11, Page 13). Tighten each fitting connection as shown in Figure 9, above.Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 9, above) and connect the 90° female fitting with service port to the #10 suction port on the compressor. Then route the 90° female fitting to the #10 evaporator hardline coming through the firewall (See Figure 10, Page 12, & Figure 11, Page 13). Tighten each fitting connection as shown in Figure 9, above. Wrap the #10 fitting connections with press tape (See Figure 10, Page 12).Locate the #6 evaporator/drier hose. Lubricate (2) #6 O-rings (See Figure 9, above) and connect the straight female fitting to the #6 drier hardline coming through the radiator core support. Then route the 90° female fitting to the #6 evaporator hardline coming through the firewall (See Figure 10, Page 12 and Figure 11, Page 13). Tighten each fitting connection as shown in Figure 9, above.Use (6) tie wraps to secure the #6 A/C hose to the brace as shown in Figure 11, Page 13.

Standard Hose Kit:

1. Refer to separate instructions included with modified hose kit.Modified Hose Kit:

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901277 REV G 02/02/21, PG 12 OF 24

Heater Hose & Heater Control Valve Installation

1.

2.

Route a piece of heater hose from the water pump to the lower heater line coming through the firewall as shown in Figure 10, below. Secure using hose clamps.Route a piece of heater hose from the intake to the upper heater line coming through the firewall as shown in Figure 10, below. NOTE: Install the heater control valve in line with the intake manifold (pressure side) heater hose, and secure using hose clamps. Also note proper flow direction.

FROM EVAPORATOR

TO WATER PUMP

FROM INTAKEMANIFOLD

FROM HTR CNTRL VLV

TO EVAPORATOR

Figure 10

ECUModule

PressTape

#10 Hardline (Insulated)

ExpansionValve

Firewall

Firewall Cover642068

O-rings

#10 A/C Hose

#6 A/CHose

HeaterHose

NOTE: Flow Direction Follows Molded Arrow on Valve.

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om

13 901277 REV G 02/02/21, PG 13 OF 24

A/

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14

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901277 REV G 02/02/21, PG 14 OF 24

Figure 12

Under Dash Louver Installation1.

2.

Install the driver and passenger side louver housings under the dash using OEM screws as shown in Figure 12, below.Install the louvers into the driver and passenger side louver housings as shown in Figure 12, below.

ControlPanel

OEMScrews

LouverHousing

Housing

Louver

Adapter

Housing

Louver

Adapter

Passenger SideVent Trim

Passenger SideVent Trim

OEM Screws

LouverHousing

15

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901277 REV G 02/02/21, PG 15 OF 24

Figure 13

Figure 14a

Figure 14

Final Steps1.2.

3.4.

5.6.7.8.

9.10.11.

12.13.

Install duct hoses as shown in Figure 15, Page 16.Route A/C wires (12 volt/grounds/binary switch/heater valve) through 3/8” grommet as shown in Figure 13, below.Install the control panel assembly. Refer to control panel instructions.Plug the wiring harnesses into the ECU module on the sub case as shown in Figure 15, Page 16. Wire according to the wiring diagrams on Pages 18 and 19.Reinstall the glove box.Reinstall the center console (if equipped). Modify the console as shown in Figures 14 & 14a, below.Reinstall all previously removed items.Fill radiator with at least a 50/50 mixture of approved antifreeze and distilled water. It is the owner’s responsibility to keep the freeze protection at the proper level for the climate in which the vehicle is operated. Failure to follow antifreeze recommendations will cause heater core to corrode prematurely and possibly burst in A/C mode and/or freezing weather, voiding your warranty.Double check all fittings, brackets and belts for tightness.Vintage Air recommends that all A/C systems be serviced by a licensed automotive A/C technician.Evacuate the system for a minimum of 45 minutes prior to charging, and perform a leak check prior to servicing.Charge the system to the capacities stated on Page 4 of this instruction manual.See Operation of Controls procedures on Page 20.

3/4”3 ¾”

MUSTANG

Passenger SideUnder Dash

Console

Cut &Remove

Top Side

3/8” Grommet

FirewallCover

16

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901277 REV G 02/02/21, PG 16 OF 24

Control Panel & Duct Hose Routing

Passenger SideDefrost Duct

2” x 14”

Driver SideDefrost Duct

2” x 26”

Passenger SideLouver

2 ½” x 60”

Driver SideLouver

2 ½” x 36”

Driver Side Center Louver

2 ½” x 20”Passenger Side Center Louver

2 ½” x 20”

Plug FromWiring

Harness232600-VUA

Plug FromControlWiring

Harness232002-VUA

Figure 15

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17 901277 REV G 02/02/21, PG 17 OF 24

Evap

orat

or H

ard

line

Inst

alla

tion

Fig

ure

16

Bra

cket

1/4”

Pus

h N

ut

1/4-

20 x

1”

Hex

Bol

t

Drive

r Sid

e Ev

apor

ator

Rear

Bra

cket

6412

73

Hea

ter

Line

(Eva

pora

tor

to I

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1066

Hea

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Line

(Eva

pora

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Wat

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ump)

0810

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#6

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1064

(2)

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#10

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18

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901277 REV G 02/02/21, PG 18 OF 24

WHT/GRN

WHT/YELWHT/RED

RED

WHTBACKLIGHT NEG

FAN WIPER

MODE WIPER

TEMP WIPER

5V-SW

GND

BACKLIGHT POS

AC ANNUNCIATOR

PRE-WIRED

GEN IV WIRING DIAGRAMREV E, 10/6/2017

GEN IV ECU

PROGRAM

Wiring Diagram

TEMP

MODE

FAN

A/C(IF USED)

232007-VUR

232002-VUA

** CIRCUITBREAKER30 AMP

*** WIDE OPENTHROTTLESWITCH

(OPTIONAL)

* DASH LAMP(IF USED)

Dash lamp is used only with type 232007-VUR harness.Warning: Always mount circuit breaker as close to the battery as possible. (NOTE: Wire betweenbattery and circuit breaker is unprotected and should be carefully routed to avoid a shortcircuit).Wide open throttle switch contacts close only at full throttle, which disables A/C compressor.

JF8

BLK

ORA

TAN

VIEWED FROM WIRE SIDE

* **

***

HEATERCONTROL VALVE

19

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901277 REV G 02/02/21, PG 19 OF 24

RED

CIRCUIT BREAKER30 AMP

+

+

-

BLACK

REDWHITE

RED

CHASSIS GROUND

A/CCOMPRESSOR

RELAY

Ignition Switch:

Dash Light:

NOTE: MOUNT RELAYIN DESIRED LOCATION

UNDER DASH

GREEN

FIREWALL

BLUE

BLUE

RED &

WHITE

VIOLET

(IGNITION HOTTERMINAL)

IGNITION SWITCH

DASH BACK LIGHT+0-12vTAN

GRAY

BLUE

WHITE

WHITE

REDRED

WHITE

COMPRESSOR

BATTERY

NOTE: CONNECT WHITEWIRES DIRECTLY TO

(-) BATTERY TERMINAL

BATRUN

12V

RED GREEN

RED

RED

BLUE

LATCH

BLACK

BINARYSAFETYSWITCH

YELLOW

ORANGE

WIRING HARNESS

Violet 12V ignition switch source (key on accessory) position must be switched.

When using a Vintage Air-suppliedcontrol panel, connect the tan wirefrom the Gen IV evaporator wiringharness to the factory dash lights toenable panel backlighting.

Binary: Connect as shown (typical compressor wiring). Be sure compressor body is grounded.

Trinary Switch: Connect according to trinary switch wiring diagram.

Install with servo motor facing down, as shown. Note flow direction arrow molded into valve body and install accordingly.

White must run to (-) battery. Red may run to (+) battery or starter. Mount circuit breaker as close to battery as possible.

Heater Control Valve:

Binary/Trinary & Compressor:

Circuit Breaker/Battery:

CONTROL WIRING HARNESS

NOTE: YELLOW & ORANGE

COMING FROM HARNESS ARE NOT

USED.

WIRING HARNESS

GRAY WIRE IS USED FOR PROGRAMING CONTROLS

IF APPLICABLE

WIRING HARNESS

Gen IV Wiring Connection Instruction

HEATERCONTROL VALVE

WARNING: ALWAYS MOUNT CIRCUIT BREAKER

AS CLOSE TO THE BATTERY AS POSSIBLE. (NOTE: WIRE BETWEEN BATTERY AND CIRCUIT BREAKER IS UNPROTECTED

AND SHOULD BE CAREFULLY ROUTED TO AVOID A SHORT CIRCUIT).

NOTE: HEATER CONTROL VALVE CONNECTION AND CHASSIS GROUND MAY BE LOCATED ON EITHER SIDE OF THE FIREWALL. ENSURECONNECTOR IS LATCHED

FIRMLY.

20

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901277 REV G 02/02/21, PG 20 OF 24

Operation of Controls

Adjust to desiredspeed.

Blower SpeedAdjust to desired

speed.

Adjust to desiredmode position (DASH position recommended).

Adjust to desiredspeed.

Adjust to DEFROST position for maximum defrost, or between FLOOR and DEFROST positions for a bi-level

blend (Compressor is automatically engaged).

Adjust to desired temperature.

For A/C operation, adjust tocoldest position to engage

compressor (Adjust between HOT and COLD to reachdesired temperature).

A/C Operation

Heat Operation

Defrost/De-fog Operation

On Gen IV systems with three lever/knob controls, the temperature control toggles between heat and A/C operations. To activate A/C, move the temperature lever/knob all the way to cold and then back it off to the desired vent temperature. For heat operation, move the temperature lever/knob all the way to hot and then adjust to the desired vent temperature. The blower will momentarily change speed, each time you toggle between operations, to indicate the change. NOTE: For proper control panel function, refer to control panel instructions for calibration procedure.

Blower Speed

Blower Speed

This lever/knob controlsblower speed, from

OFF to HI.

This lever/knob controls the mode positions,from DASH to FLOORto DEFROST, with a blend in between.

This lever/knob controlsthe temperature,

from HOT to COLD.

Blower Speed

Mode Control

Temperature Control Blower Speed

ModeControl

Temperature Control

Temperature Control

Temperature Control

Mode Control

Mode Control

Mode Control

For maximum heating, adjust to hottest position (Adjust between HOT and COLD to reach desired temperature).Adjust to desired

mode position(FLOOR position recommended).

OEM BlowerSwitch Not Used

TEMP DEFHEAT

TEMP DEF

HEAT

TEMP

DEFHEAT

TEMP

DEF

HEAT

TemperatureControl

ww

w.v

inta

gea

ir.c

om

21 901277 REV G 02/02/21, PG 21 OF 24

Sym

pto

m

Con

dit

ion

Ch

ecks

A

ctio

ns

Not

es

Blo

wer

sta

ys o

n hi

gh s

peed

whe

n ig

nitio

n is

on.

1a.

No

othe

r fu

nctio

ns w

ork.

Che

ck for

dam

aged

pin

s or

w

ires

in c

ontr

ol h

ead

plug

.Ve

rify

tha

t al

l pin

s ar

e in

sert

ed in

to p

lug.

Ens

ure

that

no

pins

are

ben

t or

dam

aged

in E

CU

.Che

ck for

dam

aged

gro

und

wire

(whi

te)

in c

ontr

ol h

ead

harn

ess.

Verify

con

tinui

ty t

o ch

assi

s gr

ound

with

whi

te c

ontr

ol

head

wire

at v

ario

us p

oint

s.

Loss

of gr

ound

on

this

wire

rend

ers

cont

rol h

ead

inop

erab

le.

All

othe

r fu

nctio

ns w

ork.

Che

ck for

dam

aged

blo

wer

sw

itch

or p

oten

tiom

eter

and

as

soci

ated

wirin

g.

Blo

wer

sta

ys o

n hi

gh s

peed

whe

n ig

nitio

n is

on

or o

ff.

Unp

lug

3-w

ire

BSC c

ontr

ol

conn

ecto

r fr

om E

CU

. If

blo

wer

sh

uts

off,

ECU

is e

ither

im

prop

erly

wired

or

dam

aged

.

Be

sure

the

sm

all,

20 G

A w

hite

gro

und

wire

is c

onne

cted

to

the

bat

tery

gro

und

post

. If

it is

, re

plac

e th

e EC

U.

Unp

lug

3-w

ire

BSC c

ontr

ol

conn

ecto

r fr

om E

CU

. If

blo

wer

st

ays

runn

ing,

BSC is

eith

er

impr

oper

ly w

ired

or

dam

aged

.

Che

ck t

o en

sure

tha

t no

BSC w

irin

g is

dam

aged

or

shor

ted

to v

ehic

le g

roun

d. T

he B

SC o

pera

tes

the

blow

er

by g

roun

d si

de p

ulse

wid

th m

odul

atio

n sw

itchi

ng.

The

posi

tive

wire

to t

he b

low

er w

ill a

lway

s be

hot

. If

the

“g

roun

d” s

ide

of t

he b

low

er is

sho

rted

to

chas

sis

grou

nd,

the

blow

er w

ill r

un o

n H

I.

Repl

ace

BSC (

This

will

req

uire

rem

oval

of ev

apor

ator

fr

om v

ehic

le).

No

othe

r pa

rt r

epla

cem

ents

sh

ould

be

nece

ssar

y.

Com

pres

sor

will

no

t tu

rn o

n (A

ll ot

her

func

tions

w

ork)

.

2.

Syst

em is

not

cha

rged

.Sy

stem

mus

t be

cha

rged

for

co

mpr

esso

r to

eng

age.

Cha

rge

syst

em o

r by

pass

pre

ssur

e sw

itch.

Dan

ger

: N

ever

byp

ass

safe

ty s

wit

ch w

ith

en

gin

e ru

nn

ing

. S

erio

us

inju

ry c

an r

esu

lt.

Syst

em is

cha

rged

.

1b

.

Trou

ble

shoo

tin

g G

uid

e

Che

ck for

fau

lty A

/C

pote

ntio

met

er o

r as

soci

ated

w

irin

g (n

ot a

pplic

able

to

3-po

t co

ntro

ls).

Che

ck for

dis

conn

ecte

d or

fa

ulty

the

rmis

tor.

Che

ck c

ontin

uity

to

grou

nd o

n w

hite

con

trol

hea

d w

ire.

Che

ck for

5V o

n re

d co

ntro

l hea

d w

ire.

Che

ck 2

-pin

con

nect

or a

t EC

U h

ousi

ng.

To c

heck

for

pro

per

pot

func

tion,

che

ck v

olta

ge a

t w

hite

/blu

e w

ire.

Vol

tage

sh

ould

be

betw

een

0V a

nd

5V,

and

will

var

y w

ith p

ot

leve

r po

sitio

n.

Dis

conn

ecte

d or

fau

lty

ther

mis

tor

will

cau

se

com

pres

sor

to b

e di

sabl

ed.

Red

wire

at A

/C p

ot s

houl

d ha

ve a

ppro

xim

atel

y 5V

w

ith ig

nitio

n on

. W

hite

w

ire

will

hav

e co

ntin

uity

to

chas

sis

grou

nd.

Whi

te/

Blu

e w

ire

shou

ld v

ary

betw

een

0V a

nd 5

V w

hen

leve

r is

mov

ed u

p or

dow

n.

3. Com

pres

sor

will

no

t tu

rn o

ff

(All

othe

r fu

nctio

ns

wor

k).

Che

ck for

fau

lty A

/C

pote

ntio

met

er o

r as

soci

ated

w

irin

g.

Che

ck for

fau

lty A

/C r

elay

.

Repa

ir o

r re

plac

e po

t/co

ntro

l wirin

g.

Repl

ace

rela

y.

See

blo

wer

sw

itch

chec

k pr

oced

ure.

ww

w.v

inta

gea

ir.c

om

22 901277 REV G 02/02/21, PG 22 OF 24

Sym

pto

m

Con

dit

ion

Ch

ecks

A

ctio

ns

Not

es

Syst

em w

ill n

ot

turn

on,

or

runs

in

term

itten

tly.

4.

Wor

ks w

hen

engi

ne is

not

runn

ing;

shu

ts o

ff w

hen

engi

ne is

sta

rted

(t

ypic

ally

ear

ly G

en I

V,

but

poss

ible

on

all

vers

ions

).

Noi

se in

terf

eren

ce fro

m e

ither

ig

nitio

n or

alte

rnat

or.

Inst

all c

apac

itors

on

igni

tion

coil

and

alte

rnat

or.

Ensu

re

good

gro

und

at a

ll po

ints

. Re

loca

te c

oil a

nd a

ssoc

iate

d w

irin

g aw

ay fro

m E

CU

and

ECU

wirin

g. C

heck

for

bur

ned

or lo

ose

plug

wires

.

Verify

con

nect

ions

on

pow

er

lead

, ig

nitio

n le

ad,

and

both

whi

te g

roun

d w

ires

.

Verify

pro

per

met

er fun

ctio

n by

che

ckin

g th

e co

nditi

on o

f a

know

n go

od b

atte

ry.

Igni

tion

nois

e (r

adia

ted

orco

nduc

ted)

will

cau

se t

he

syst

em t

o sh

ut d

own

due

tohi

gh v

olta

ge s

pike

s. I

f th

isis

sus

pect

ed,

chec

k w

ith a

qu

ality

osc

illos

cope

. Spi

kes

grea

ter

than

16V

will

shu

t do

wn

the

ECU

. In

stal

l a

radi

o ca

paci

tor

at t

he

posi

tive

post

of th

e ig

nitio

nco

il (s

ee r

adio

cap

acito

r in

stal

latio

n bu

lletin

). A

fa

ulty

alte

rnat

or o

r w

orn

out

batt

ery

can

also

res

ult

in t

his

cond

ition

.

Will

not

tur

n on

und

er

any

cond

ition

s.Ve

rify

bat

tery

vol

tage

is

grea

ter

than

10

volts

and

less

than

16.

Loss

of m

ode

door

fu

nctio

n.

No

mod

e ch

ange

at

all.

Che

ck for

dam

aged

mod

e sw

itch

or p

oten

tiom

eter

and

as

soci

ated

wirin

g.

Part

ial f

unct

ion

of m

ode

door

s.

Typi

cally

cau

sed

by

evap

orat

or h

ousi

ng

inst

alle

d in

a b

ind

in t

he

vehi

cle.

Be

sure

all

mou

ntin

g lo

catio

ns li

ne u

p an

d do

n’t

have

to

be for

ced

into

pos

ition

.

Blo

wer

tur

ns o

n an

d of

f ra

pidl

y.

6.

Bat

tery

vol

tage

is a

t le

ast

12V.

Che

ck for

at

leas

t 12

V a

t ci

rcui

t br

eake

r.En

sure

all

syst

em g

roun

ds a

nd p

ower

con

nect

ions

are

cl

ean

and

tight

.

Bat

tery

vol

tage

is le

ss

than

12V

.

5.

Trou

ble

shoo

tin

g G

uid

e (C

ont.

)

Che

ck for

fau

lty b

atte

ry o

r al

tern

ator

.Cha

rge

batt

ery.

Syst

em s

huts

off b

low

er a

t 10

V. P

oor

conn

ectio

ns o

r w

eak

batt

ery

can

caus

e sh

utdo

wn

at u

p to

11V

.

7. Whe

n ig

nitio

n is

tu

rned

on,

blo

wer

m

omen

tarily

co

mes

on,

the

n sh

uts

off.

This

oc

curs

with

the

bl

ower

sw

itch

in

the

OFF

pos

ition

.

This

is a

n in

dica

tor

that

the

sy

stem

has

bee

n re

set.

Be

sure

the

red

pow

er w

ire

is o

nth

e ba

tter

y po

st,

and

not

on a

sw

itche

d so

urce

. Als

o, if

the

sy

stem

is p

ulle

d be

low

7V for

even

a s

plit

seco

nd,

the

syst

em w

ill r

eset

.

Run

red

pow

er w

ire

dire

ctly

to

batt

ery.

Che

ck for

pos

itive

pow

er a

t he

ater

val

ve g

reen

wire

and

blow

er r

ed w

ire.

Che

ck for

gro

und

on c

ontr

ol h

ead

whi

te

wire.

Che

ck for

obs

truc

ted

or

bind

ing

mod

e do

ors.

Che

ck for

dam

aged

ste

pper

m

otor

or

wirin

g.

Erra

tic fun

ctio

ns o

fbl

ower

, m

ode,

te

mp,

etc

.

Che

ck for

dam

aged

sw

itch

or

pot

and

asso

ciat

ed w

irin

g.Re

pair o

r re

plac

e.

8.

23

www.vintageair.com

901277 REV G 02/02/21, PG 23 OF 24

OEM Center Vent Trim Louver Template

Cut Along

Dotted Line

Cut A

long D

otted Line

Cut O

utCut O

ut

Cut Along

Line

1 7/16”1 9/16”

3 9/16”

1 7/16”

3 9/16”

7 ⅞”

NOTE: Tolerances are extremely tight on the OEM center vent trim. Due to printing variances, measure the line below before using this template. If template is scaled properly, the line should measure 6 inches.

24

www.vintageair.com

901277 REV G 02/02/21, PG 24 OF 24

Packing List: Evaporator Kit (551168)

No. 1.2.

Qty.11

Part No.744004-VUE781067

DescriptionGen IV 4-Vent Evaporator Sub CaseAccessory Kit

NOTE: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

1

2

Gen IV 4-Vent Evaporator Sub Case

744004-VUE

Accessory Kit781067

Checked By:Packed By:

Date: